Gravitational instrument



Feb. 15 1938. s, a. VON THYSSEN-BORNEMISZA 2,108,421

GRAVITATIONAL INSTRU MENT k Original Filed Sept. 6, 1934 SI'ephan Ba ran nn'm sspn-Bm Iemuy! lnvenzvn:

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Patented Feb. 15, 1938 caavr'rarronnn nvs'rn stephan ron von' Thys sen-Bomemisza', The

\ Hague, Netherlands Original application September 6, 1934i, Serial No. 742,878. Divided and this application October 16, 1935, Serial No. 45,190

in Germany July 9, 1934 3 Cia.

The invention is a division of my copending application Ser- No. 742,878, filed Sept. 6, 1934. The subject of-said copending application is a measuring instrument for the determination of variations of the gravitational acceleration-which consists of a lever system comprising a lever connected with a mass and arranged in such a manner that a variation of the gravitational acceleration changes its position, thereby producing an oscillation showing the variation of the gravim tational acceleration. A spring acts against the movement of the lever system in such a manner,

- celeration a lever systemcomprisinga beam comthat an increase of the gravitational acceleration produces an increase of the lever arm oi the mass. v

The present. invention relates to a measuring instrument for the determination of variations of the gravitational acceleration which also consists of-a' lever system and a spring and in which by an increase of the gravitational acceleration 20 the lever arm upon which the spring acts is shortened.

The invention will be more clearly described with reference to the accompanying drawing.-

Iherein the lever system consists of a bent beam 25 comprising a horizontal portlon'and a further What I claim and desire to secure by Letters Patent of the United States is:

1. In a measuring instrument for the determination'of variations of the gravitational acprising one part lying substantially horizontal and a second part extending obliquely upwards, a mass attached to the end of the horizontal portion, a spring attached to the end of the obliquely positioned portion, a knife edge upon which the beam is pendulating and a connection for the lower end of the spring.

- 2. In a gravitational instrument an angularly shaped, pivotally supported lever, a, mass attached to one arm of said lever and a spring at- 20 I tached to the other arm of said lever and opposing variation in the position of the mass, whereby any'movement of the latter caused by an increase portion extendingfupwards. At the end of the horizontal portion a mass M is arranged, whereas a spring is situated at the end of the portion extending upwards, said spring balancing the mass.. I At the place where the beam is bent there is provided a knife edge. In the original position the lever arm of the mass is shown at L and the lever arm of the spring E at L1. Upon an increase oi the gravitational acceleration the mass moves downwards, whereas the spring is expanded. The lever arm of the mass remains practically unaltered, whereas the lever arm of the spring is decreased from Lil into L2. Thus, if the equilibrium is disturbed there is caused at 40 first a displacement of the mass, in consequence of said displacement a decrease of the counter force produced by the spring and then again a displacement of the mass. The relation between of the gravitational acceleration diminishes the 3. In a gravitational instrument a, lever system comprising a rigid structure pivotally ar ranged, a mass being attached to the one side of said structure in a horizontal plane substantially equal to that of the pivoting point 0! the rigid structure so that the lever arm of the mass remains substantially unchanged upon a variation' 01- the gravitational acceleration, and a spring attached to the other side of the rigid structure in a horizontal plane di flerentirom that through the *pivoting point so that the effective length of the lever arm of the spring is decreased upon an increase of the gravitational 4 acceleration.

STEPHAN lBARON von 7.

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eflective length of the lever arm of the spring in relation to that of the lever arm of the mass. 

